php 学说2关联未初始化
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13431614/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
doctrine2 association is not initialized
提问by Laokoon
I have a Class like the following:
我有一个如下所示的类：
/** @Entity **/
class orgGroup{
//id and stuff...
/**
* @Column(type="string")
**/
private $name;
/**
* @Column(type="string", nullable=true)
**/
private $description;
/**
* @ManyToOne(targetEntity="orgGroupType", inversedBy="_orgGroups")
* @JoinColumn(name="_orgGroupType")
**/
private $_orgGroupType;
//...
}
But when i load this Object from my database via
但是当我从我的数据库加载这个对象时
$groups = $em->getRepository("orgGroup")->findAll();
I just get the name correctly but not the _orgGroupType... and i dont know why... OrgGroup is the owner of orgGroupType and its just ONE object and not an array. My Webservice always just says:
我只是正确地得到了名称，但没有得到 _orgGroupType ......我不知道为什么...... OrgGroup 是 orgGroupType 的所有者，它只是一个对象而不是数组。我的网络服务总是说：
{"error":[],"warning":[],"message":[],"data":[{"name":"AdministratorGroup","description":null,"_orgGroupType":{"__ isInitialized __":false}}]}
The result is:
结果是：
"name":"AdministratorGroup",
"description":null,
"_orgGroupType":{"__ isInitialized __":false}
but should be:
但应该是：
"name":"AdministratorGroup",
"description":"some description",
"_orgGroupType":{name:"test"}
So there are 2errors... and I have no idea why. All the data is set correctly in the database.
所以有2个错误......我不知道为什么。所有数据都在数据库中正确设置。
Any Ideas?
有任何想法吗？
EDIT: Here's the missing code of my orgGroupType -entity
编辑：这是我的 orgGroupType -entity 的缺失代码
/** @Entity **/
class orgGroupType {
/**
* @OneToMany(targetEntity="orgGroup", mappedBy="_orgGroupType")
**/
private $_orgGroups;
public function __construct()
{
$this->_orgGroups = new ArrayCollection();
}
}
回答by Praveen
Try to change fetch mode to EAGER.
尝试将 fetch 模式更改为EAGER。
@ORM\ManyToOne(targetEntity="****", fetch="EAGER").
It worked for me.
它对我有用。
回答by Manuel
This looks to me like a lazy-loading-issue. How do you get the data from the object into the Webservice answer?
这在我看来像是一个延迟加载问题。你如何从对象中获取数据到 Webservice 答案中？
Doctrine2 is lazy-loading if you don't configure something else, that means your $groups = $em->getRepository("orgGroup")->findAll();won't return real orgGroupobjects, but Proxy objects (Doctrine Documentation).
如果您不配置其他内容，Doctrine2 是延迟加载的，这意味着您$groups = $em->getRepository("orgGroup")->findAll();不会返回真实orgGroup对象，而是返回代理对象（Doctrine 文档）。
That means a $groupobject won't have it's description or orgGroupType value until you call $group->getDescription()or $group->getOrgGroupType()(then Doctrine loads them automatically), so you need to do that before writing the data into the JSON-response for the webservice. It won't work if you somehow loop through the object properties without using the getter methods.
这意味着一个$group对象在你调用$group->getDescription()or之前不会有它的描述或 orgGroupType 值$group->getOrgGroupType()（然后 Doctrine 自动加载它们），所以你需要在将数据写入 web 服务的 JSON 响应之前这样做。如果您以某种方式循环遍历对象属性而不使用 getter 方法，它将无法工作。
I hope that was the problem :)
我希望这是问题:)
回答by TNP
//Group.php ...
public function addUser(User $user): self
{
if (!$this->users->contains($user)) {
$this->users[] = $user;
$user->addJoinedGroup($this); /** VERY IMPORTANT **/
}
return $this;
}
Same in User.phpWithout it, it didn't do anything in my database
同样User.php没有它，它在我的数据库中没有做任何事情
回答by Pankrates
Be sure to initialize the orgGroups collection in the orgGroupType entity
务必在 orgGroupType 实体中初始化 orgGroups 集合
/**
* @OneToMany(targetEntity="orgGroup", mappedBy="_orgGroupType")
*/
protected $orgGroups ;
public function __construct() {
$this->orgGroups = new ArrayCollection();
}
You might need to include the following in the Entity
您可能需要在实体中包含以下内容
use Doctrine\Common\Collections\Collection,
Doctrine\Common\Collections\ArrayCollection;
